linux-kernel - Re: [PATCH 1/2] tty: serial: msm_serial: Fix lockup for sysrq and oops

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Date:   Sun, 24 Nov 2019 16:00:21 -0700
From:   Jeffrey Hugo <jeffrey.l.hugo@...il.com>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Nicolas Dechesne <nicolas.dechesne@...aro.org>,
        MSM <linux-arm-msm@...r.kernel.org>,
        linux-serial@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] tty: serial: msm_serial: Fix lockup for sysrq and oops

On Sun, Nov 24, 2019 at 8:44 AM Leo Yan <leo.yan@...aro.org> wrote:
>
> As the commit 677fe555cbfb ("serial: imx: Fix recursive locking bug")
> has mentioned the uart driver might cause recursive locking between
> normal printing and the kernel debugging facilities (e.g. sysrq and
> oops).  In the commit it gave out suggestion for fixing recursive
> locking issue: "The solution is to avoid locking in the sysrq case
> and trylock in the oops_in_progress case."
>
> This patch follows the suggestion (also used the exactly same code with
> other serial drivers, e.g. amba-pl011.c) to fix the recursive locking
> issue, this can avoid stuck caused by deadlock and print out log for
> sysrq and oops.
>
> Signed-off-by: Leo Yan <leo.yan@...aro.org>

Shouldn't this patch have a Fixes tag?

Was there a cover letter?